News items for tag weathermapsite - Koos van den Hout

2018-05-24 Stopping the weather map site
In all the web content that has to be migrated to a new environment I noticed the weather map site depends on a load of complex scripts to generate it and never got any amount of visitors.

So I decided to stop that site. I'll archive all the scripts around it so I can pick it up again some day.

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2012-08-03 (#)
Time to count IPv6 visitor percentage to different websites again:
SiteJuly 2009July 2010July 2011July 2012 my homepage 1% 2% 2% 3% weather maps < 1% 5% 6% 7% hcc!pcgg netwerkgroep 2% 2% 2% 3% BBS files 1% 1% 1% the webcam < 1% 1% < 1% 2% The Virtual Bookcase < 1% 1% 1% 4% Camp Wireless < 1% 1% 1% 3%
Interesting numbers. Websites with a more 'general' audience are now also growing this year.

Method: unique IPv6 addresses seen in the whole month / total unique addresses seen in the whole month.

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2012-05-02 (#)
Another improvement to the homepage: the weather projects get a bit more attention, with the latest weathermap for the Netherlands and the current weather readings in the right-hand sidebar. This costs about 0.02 second so it may need some optimization. In the optimization process I could even make the weather data publicly available in some portable format.

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2011-01-07 (#)
Since almost all my websites are now hosted at home behind a not-too-bright ADSL link with 1 megabit upstream I sometimes wonder about what I'll do when something I host gets slashdotted. I don't write that much which might suddenly be interesting but sometimes the intarwebs decide something else.

I do have a server at work with enough upstream bandwidth, but I will not use that server for anything which would remotely be interpretable as 'commercial'. So I could only use that server when it would involve for example the weather maps.

Another solution for bandwith-hogging binaries would be to host them on my xs4all homepage which has enough space. But copying stuff over there would be a lot of work or take some serious scripting.

What could be interesting (in the case of images or other binary stuff causing the problem) is trying Coral Cache which can be done using some simple mod_rewrite tricks as noted in Saving Bandwidth and Preventing Hotlinking With Coral Cache. The note about not using Coral Cache when not being slashdotted is true: the demo image loads slower at the moment. The article is from August 2007.

Anyway, this is all very very theory: even when a comment on an article on a very popular site linked to a file on the bbs archive it still didn't cause any real trouble.
Update : A small test does not give me a lot of confidence in Coral Cache:
koos@kolham:~$ host has DNAME record is an alias for is an alias for has address has address has address
Host not found: 3(NXDOMAIN)
koos@kolham:~$ host
Host not found: 3(NXDOMAIN)
koos@kolham:~$ host
Host not found: 3(NXDOMAIN)
Seems like their DNS and the local resolver dislike eachother.

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2010-11-11 (#)
With all the interesting weather today on the Northsea I added the Northsea area at with fresh weather maps every hour.

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2010-08-23 (#)
Het waait stevig.. let ook op de windvlaggetjes op Nederland 2010-08-23 14:00 .. vooral de waarnemingen over zee hebben tot 9 Beaufort! Waarnemingsposten EHKV en EHQE.
Update: Op 15:00 nog meer harde wind, windkracht 10 op EHKV Nederland 2010-08-23 15:00.

EHKV = oil platform K14-fa-1c in the Northsea.

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2010-08-03 (#)
There is an interesting relation between 'website with technical subject' and 'visitors with IPv6'. I counted the number of unique addresses of visitors via IPv6 to several websites I run for the month of July 2010 and found the following percentages: Comparing it to July 2009 (percentages between parentheses) does show growth.

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2010-08-03 (#)
I've done some work on the weather map site. I'm improving the plotting script to have a better abstraction of data and plotting so I can do plots for multiple countries.

As a first I'm plotting Denmark. The reasons are simple: it's a not too big country and has a reasonable number of weather stations.

Weather maps Denmark.

Now to see if that gives visitors :)

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2009-01-09 (#)
I noticed some funny stuff on the maps plotted at the weather map site. Non-fitting temperatures like 28°C in the south of the Netherlands where it is -4°C to -8°C according to the people who know. Or 5°C at site 'EHDV' which was plotted somewhere in the eastern part of the country, near Marknesse, but the reading for Marknesse was not the same.

The first error was caused by the recent upgrade at home: Ubuntu comes with Geo::METAR 1.14. I did not notice this right away because they did fix the error about only accepting metar data from the USA. So I put in my own Geo::METAR which fixes the parsing. The other error was that EHDV was in the wrong location in my data. Searching using google found that EHDV is the code for oil platform D15-FA-1 which is also hard to find, but somewhere deep in the data history of air traffic control the Netherlands is the right location out on the North Sea. Where it is indeed a lot warmer than in the east of the country, thanks to less cold wind from the east and more warm wather from the Gulf stream.

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IPv6 check

Running test...
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Meningen zijn die van mezelf, wat ik schrijf is beschermd door auteursrecht. Sommige publicaties bevatten een expliciete vermelding dat ze ongevraagd gedeeld mogen worden.
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Other webprojects: Camp Wireless, wireless Internet access at campsites, The Virtual Bookcase, book reviews
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